I'm beginning to wonder if this stacking, may have unseen benefits ... I remember my local nursery-owner telling me, that my tomatoes wouldn't do well in pots, they need 'depth' ... he said a tomato plant sends a very deep taproot down, the diameter isn't nearly as important ... "they love postholes", he said ... tomatoes and cannabis are related, to some degree ... wonder how they'd like that ? ... weird, I've been looking at post-hole diggers at Home Depot, and didn't know what I'd ever use one for ...